Είναι η μέτρηση των διαθλαστικών σφαλμάτων των οφθαλμών δηλαδή της μυωπίας, της υπερμετρωπίας, του αστιγματισμού και της πρεσβυωπίας. (Εξειδικευμένες τεχνικές εξέτασης και ηλεκτρονική μέτρηση των διαθλαστικών ανωμαλιών με τελευταίας γενιάς μηχανήματα. )
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